The utility model relates to a syringe body pushed into a plunger by a feeding screw mechanism.A dense amount of movement can be applied to the plunger pushing member (6).A syringe driving unit (1) for high-precision dispensing of medicine liquid from the syringe body,The syringe bracket (3) is fixed on the surface side of the bottom plate (2) to maintain the syringe body；A guide rail (4) arranged at the back side of the base plate (2) along the axis direction of the syringe body；The sliding piece (5) assembled on the guide rail (4) through the rolling body；Having an arm (61) which is fixed on the sliding member (5) and protrudes from the back side of the base plate (2) to the surface side at the same time,A plunger pushing member (6) which can hold the plunger included in the syringe body at the arm (61)；A screw shaft (7) of the specified rotation is applied by a motor (9) arranged parallel to the guide rail (4)；And the movement amount corresponding to the rotation amount of the screw shaft (7) can be applied to the screw cap member (8) of the plunger pushing member (6).一種在利用進給螺旋機構對注射器本體推入柱塞時，可對柱塞推壓構件(6)施加緻密的移動量，從注射器本體高精度吐出藥液的注射器驅動單元(1)，是由：固定在底板(2)表面側對注射器本體進行保持的注射器支架(3)；沿著上述注射器本體軸線方向設置在底板(2)背面側的導軌(4)；透過滾動體組裝在導軌(4)的滑件(5)；具有被固定在該滑件(5)的同時從底板(2)背面側往表面側突出的臂部(61)，可在該臂部(61)對納入在上述注射器本體的柱塞進行保持的柱塞推壓構件(6)；由設置成和上述導軌(4)平行的馬達(9)施加指定旋轉的螺軸(7)；及可使該螺軸(7)旋轉量對應的移動量施加在上述柱塞推壓構件(6)的螺帽構件(8)所構成。
